@article{28559, author = "Cohen, Benjamin R. and 11th Conference of the International Cartographic Association.ICA Warsaw, July 29. - August 4. 1982", title = "School Atlases in the People's Republic of Bulgaria. History, Situation and Problems. 11th Conference of the International Cartographic Association. Warsaw, July 29 - August 4. 1982 ", year = "1982", note = "1 sv.", }